<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>盒子模型</title>
		<style type="text/css">
		.tt{
			/* border: 10px red solid;
			margin: 10px,20px,11px,20px;
			margin-left: 100px;
		margin-top: 50px;
		margin-bottom: 100px;
			padding:10px,20px,11px,20px ;
			 */
			border: 1px red solid;
		}	
		</style>
	</head>
	<body>
		<p class="tt" align="center">盒子</p>
	</body>
</html>
